/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/Abilities/GameplayAbility.h
Returns how the ability is instanced when executed. This limits what an ability can do in its implementation.
[EGameplayAbilityInstancingPolicy::Type](API\Plugins\GameplayAbilities\Abilities\EGameplayAbilityInstancingPolicy-) GetInstancingPolicy() const